This picture shows the Forth Bridge during the First World War with navel vessels visible heading out to sea.
The Forth was the most heavily defended Scottish port even before World War One broke out.
The decision in 1903 to construct the Navel base at Rosyth resulted in an upgrade of defences.
But it wasn’t until October 16, 1939 when the first German air attack on Britain took place, that the bridge was under threat.
Twelve German Junkers JU 88 bombers reached the Scottish coast. The actual target of attack was shipping from the Rosyth Naval base.